5—the Action of Ozone on Cellulose and Modified Cellulose

Dorée, Charles; Healey, Anna

doi:10.1080/19447023808658836

Cited by 16 publications

(5 citation statements)

References 8 publications

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“…The results show that at any given pH, the effect of ozone treatment is maximum at 50% WP, followed by 100 and 10% WP levels. A similar trend is obtained in the action of ozone on cellulose wherein it is reported that the oxidation is maximum when the water content is between 45 and 50% 39. The trend obtained in the present study is explained based on the distribution of water molecules at different regions in the silk fiber polymer matrix.…”

Section: Resultssupporting

confidence: 89%

Aortic valve morphology is associated with outcomes following balloon valvuloplasty for congenital aortic stenosis: Reflection on morphological retrospection aids selection for interventional rejection

Wilson

2012

Cathet Cardio Intervent

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Section: Resultssupporting

confidence: 89%

Aortic valve morphology is associated with outcomes following balloon valvuloplasty for congenital aortic stenosis: Reflection on morphological retrospection aids selection for interventional rejection

Wilson

2012

Cathet Cardio Intervent

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“…Figure 10B clearly shows that a pick‐up of 75% was optimised among all the different samples with a rate constant of 0.297 min −1 , 0.578 K / S −1 min −1 and 0.925 min −1 for RB‐RN‐, RR‐2BL‐ and RY‐2RN‐dyed cotton, respectively. This phenomenon is similarly described in related work reported by Dorée and Healey 55 . The rate constants of ozonation on samples of 0% pick‐up were found to be nearly 0 (for all three types of reactive‐dyed cotton).…”

Section: Resultssupporting

confidence: 87%

A comparative study of ozonation on aqueous reactive dyes and reactive‐dyed cotton

2021

Coloration Technology

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Ozonation is increasingly being used and reported in recent years. This paper investigates ozonation on aqueous reactive dyes and their dyed cotton comparatively. The effects, including pH, temperature and initial dye concentration (for aqueous dyes)/water pick‐up (for dyed cotton), on Reactive Blue FL‐RN, Reactive Red FL‐2BL and Reactive Yellow FL‐2RN, were studied via Fourier Transform–infrared spectroscopy, ultraviolet‐visible absorption and k/s curves. The kinetic results indicated that all the aqueous dyes were of pseudo‐first order kinetics, while dyed cotton represented pseudo‐secondary or pseudo‐third order kinetics. Based on their different mechanisms, there was a dramatic gap between dyes and dyed cotton in ozonation performance. The curve of rate constant vs pH of dye ozonation exhibited a U‐shape with the minimum value at pH 7, but for dyed cotton ozonation, the curve showed a Λ‐shape optimised at pH 10. Also, high temperature resulted in hydrolysis of dyes in aqueous solution, whereas this was not applicable to dyed cotton. The effect of pick‐up (0%‐150% with an interval of 75%) on reactive‐dyed cotton was greater than the effect of initial dye concentration (which varied from 120 to 40 mg/L) on the colour yield of aqueous reactive dyes.

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“…A similar trend is obtained in the action of ozone on cellulose wherein it is reported that the oxidation is maximum when the water content is between 45 and 50%. 39 The trend obtained in the present study is explained based on the distribution of water molecules at different regions in the silk fiber polymer matrix. Figure 3 gives the schematic representation of ozone path from gas phase to reaction site.…”

Section: Effect Of Wpmentioning

confidence: 99%

Effects of ozone treatment on the properties of raw and degummed tassar silk fabrics

Sargunamani¹,

Selvakumar²

2007

J of Applied Polymer Sci

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Ozone is a powerful oxidizing agent and is widely used in various applications, which includes bleaching of cotton. Literature on the action of ozone on silk is almost not available. Therefore, an elaborate study was carried out to understand the effects of process parameters in the ozone treatment of raw and degummed tassar silk fabrics on their properties. The study was extended with a view to compare the ozone treatment with soap degumming and hydrogen peroxide treatment carried out on raw and degummed tassar silk fabrics, respectively. The treatment results in improvement in pliability of the fabric and reduction in color. Decrease in breaking strength, breaking elongation, and weight as well an increase in amino group content is also experienced by the material. The results obtained are substantiated with tyrosine content, scanning electron micrographs, and infrared spectroscopy of the treated materials. The effect of pH on the treatment is maximum upto pH 4 and then decreases. The treatment is more severe when the wet pickup used is 50% compared to 10 and 100%. With respect to treatment time, though the severity increases with time, it is maximum during the first 10 min of the treatment. Soap degumming of raw silk fabric results in little higher yellowness index and lesser loss in breaking strength and elongation and flexural rigidity compared to that of ozone-treated material. There is not much of difference between ozone and hydrogen peroxide treatments of degummed silk fabric, except for the lesser yellowness index obtained in the latter case.

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5—the Action of Ozone on Cellulose and Modified Cellulose

Cited by 16 publications

References 8 publications

Aortic valve morphology is associated with outcomes following balloon valvuloplasty for congenital aortic stenosis: Reflection on morphological retrospection aids selection for interventional rejection

Aortic valve morphology is associated with outcomes following balloon valvuloplasty for congenital aortic stenosis: Reflection on morphological retrospection aids selection for interventional rejection

A comparative study of ozonation on aqueous reactive dyes and reactive‐dyed cotton

Effects of ozone treatment on the properties of raw and degummed tassar silk fabrics

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